A reflected ultrasound pulse brings back two kinds of information. The of the reflected pulse relative to that of the incident pulse gives information on the type of interface that produced the reflection. The gives information about the distance between the transducer and the reflecting interface.

If the skin preparation site contains a colostomy or draining sinus that cannot be sealed off, how should that area be prepped? a. last, with sponges to be used once and discarded b. first, with the same preparation tray c. simultaneously, with the same preparation tray d. first, with a separate preparation tray